the same hands that create delicate origami flowers also strangled his former girlfriend. 21-year-old viviana tulli. >> you sit there and strangle somebody, it's personal. about as personal as you can get. i'm a very nice person. i am. but i guess everybody has a switch, some people act on it, some people don't. i just acted. it's a very thin line. very thin line. >> now almost three years after the murder, goodell has reached an agreement with prosecutors. he pled guilty to first-degree murder for a maximum of 45 years in state prison. the final sentence is still up to his judge and will be announced in an upcoming hearing. >> for 45% or 85% you would do 38, minus the three i have i already, that's 35. that would make me about 68 when i go home.